Modified gravity

The ideal weighing box thought experiment and gravitational shielding

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Spacetime going through a double slit experiment and the superposition of spacetime is the main thought experiment in quantum gravity. But can a simpler and non-quantum thought experiment with a box tell us more about the true nature of gravity? Can this thought experiment be performed in an approximated way? Is there partial gravitational shielding when energy can be absorbed from a gravitational wave?

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MOND as a transformation between non-inertial reference frames via Sciama’s interpretation of Mach’s Principle

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The motivations to search for Milgrom’s Modified Newtonian Dynamics (MOND) in Mach’s principle are explored from a complete explanation of Mach’s principle related to MOND phenomenology. The Machian MOND approximation is a necessary feature of a theory of modified inertia or modified gravity which incorporates Mach’s principle in agreement with galaxy rotation curves.

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Does MOND work? and the origin of inertia

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MOND correctly predicts galaxy rotation curves, but fails in galaxy clusters and other evidence for dark matter. Does this mean that MOND is incorrect? The original author of MOND suggested that MOND should come from modified inertia, but a phenomenological explanation of MOND has never been found. There are many proposals of modifiying inertia based on Mach’s principle and the relativity of acceleration, but shouldn’t these approximate to MOND’s formulation?

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Einstein’s theoretical failures of General Relativity

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Einstein developed General Relativity between 1907 and 1915 in the search for the introduction of acceleration in special relativity by the equivalence principle, and a relativistic explanation for gravity, among others. Leaving aside experimental incompatibilities of General Relativity with observations, there are theoretical and fundamental issues with the theory, such as gravitational potential energy and Mach’s principle.

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